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* coding.h (struct coding_system): Remove 'error_positions' (unused)

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and 'errors' (set but unused) fields.  Use bitfields for 'eol_seen',
'mode', 'common_flags' and 'result' fields, adjust layout to avoid
extra padding and shrink struct coding_system by 56 bytes (x86_64).
* coding.c (decode_coding_utf_8, decode_coding_utf_16)
(decode_coding_emacs_mule, decode_coding_iso_2022, decode_coding_sjis)
(decode_coding_big5, decode_coding_charset, decode_coding)
(encode_coding): Adjust users.
This commit is contained in:
Dmitry Antipov 2014-07-10 08:35:55 +04:00
parent 09880d8533
commit 80fb41cd90
3 changed files with 39 additions and 43 deletions
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61
src/coding.h
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@ -434,11 +434,37 @@ struct coding_system
/* Flag bits of the coding system. The meaning of each bit is common
to all types of coding systems. */
int common_flags;
unsigned common_flags : 14;
/* Mode bits of the coding system. See the comments of the macros
CODING_MODE_XXX. */
unsigned int mode;
unsigned mode : 5;
/* The following two members specify how binary 8-bit code 128..255
are represented in source and destination text respectively. True
means they are represented by 2-byte sequence, false means they are
represented by 1-byte as is (see the comment in character.h). */
bool_bf src_multibyte : 1;
bool_bf dst_multibyte : 1;
/* True if the source of conversion is not in the member
`charbuf', but at `src_object'. */
bool_bf chars_at_source : 1;
/* Nonzero if the result of conversion is in `destination'
buffer rather than in `dst_object'. */
bool_bf raw_destination : 1;
/* Set to true if charbuf contains an annotation. */
bool_bf annotated : 1;
/* Used internally in coding.c. See the comment of detect_ascii. */
unsigned eol_seen : 3;
/* Finish status of code conversion. */
ENUM_BF (coding_result_code) result : 3;
int max_charset_id;
/* Detailed information specific to each type of coding system. */
union
@ -451,16 +477,8 @@ struct coding_system
struct undecided_spec undecided;
} spec;
int max_charset_id;
unsigned char *safe_charsets;
/* The following two members specify how binary 8-bit code 128..255
are represented in source and destination text respectively. True
means they are represented by 2-byte sequence, false means they are
represented by 1-byte as is (see the comment in character.h). */
bool_bf src_multibyte : 1;
bool_bf dst_multibyte : 1;
/* How may heading bytes we can skip for decoding. This is set to
-1 in setup_coding_system, and updated by detect_coding. So,
when this is equal to the byte length of the text being
@ -472,21 +490,9 @@ struct coding_system
sequence. Set by detect_coding_utf_8. */
ptrdiff_t detected_utf8_bytes, detected_utf8_chars;
/* Used internally in coding.c. See the comment of detect_ascii. */
int eol_seen;
/* The following members are set by encoding/decoding routine. */
ptrdiff_t produced, produced_char, consumed, consumed_char;
/* Number of error source data found in a decoding routine. */
ptrdiff_t errors;
/* Store the positions of error source data. */
ptrdiff_t *error_positions;
/* Finish status of code conversion. */
enum coding_result_code result;
ptrdiff_t src_pos, src_pos_byte, src_chars, src_bytes;
Lisp_Object src_object;
const unsigned char *source;
@ -510,17 +516,6 @@ struct coding_system
int *charbuf;
int charbuf_size, charbuf_used;
/* True if the source of conversion is not in the member
`charbuf', but at `src_object'. */
bool_bf chars_at_source : 1;
/* Nonzero if the result of conversion is in `destination'
buffer rather than in `dst_object'. */
bool_bf raw_destination : 1;
/* Set to true if charbuf contains an annotation. */
bool_bf annotated : 1;
unsigned char carryover[64];
int carryover_bytes;